http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Prescribed-time Group Consensus for Multiagent System Based on a Distributed Observer Approach
Lingfei Dai,Xin Chen,Liuxiao Guo,Jiancheng Zhang,Jing Chen 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.10
The prescribed-time observer-based control for the group consensus problems of multi-agent systems is first investigated in this paper. Distributed observers are designed to estimate the state information in any predefined time of physical allowance when the agent is assumed to be not available or unmeasurable. The prescribed-time control protocols including a group projective parameter are presented to achieve group consensus within a predetermined time, which is independent of system parameters and initial values. Based on algebraic graph theory, Lyapunov stability and matrix theory, sufficient conditions of the designed parameters are established to realize prescribed time group consensus under both undirected and directed topology networks. The effectiveness of the proposed approaches is confirmed by simulation verification.
Mate recognition and antennal morphology of Octodonta nipae (Coleoptera: Chrysomelidae) adults
Lingfei Peng,Limin Chen,Jinlei Li,Youming Hou,Yigen Chen 한국응용곤충학회 2018 Journal of Asia-Pacific Entomology Vol.21 No.1
The nipa palm hispid beetle, Octodonta nipae (Maulik) has been killing palm trees since its introduction intoHainan province, China, from Malaysia in 2001. It continues to spread within Hainan province, northeast toFujian province, and northwest to Yunnan province within China. Knowledge on signals involved in mate locationand recognition could help develop effective integrated pest management programs. In the present study,we first experimentally proved that antennae were essential in success of O. nipae mating. We then excisedvarious segments/flagellomeres of adult male and female antennae and observed their mating behavior. Resultsrevealed that the 5th to 9th flagellomeres, especially those of males, were important for the mating success. Finally, in an attempt to elucidate the types of antennal sensilla accountable for the mating success, morphologyof O. nipae antennae was studied in detail with scanning electron microscopy. Six types of sensilla were distinguished:aporous sensilla trichodea (T1), multiporous sensilla trichodea (T2), aporous sensilla chaetica (Ch1),uniporous sensilla chaetica (Ch2), multiporous sensilla basiconica (B), and Böhm sensilla (Bm). Aporous sensillatrichodea is the most abundant; multiporous sensilla trichodea and sensilla basiconica are considered as olfactoryreceptors, and uniporous sensilla chaetica as gustatory receptor. Importance of flagellomeres 5–9 in matingsuccess seemed to correspond to the abundance of sensilla on these segments.
Ferroelectrically tunable magnetic skyrmions in ultrathin oxide heterostructures
Wang, Lingfei,Feng, Qiyuan,Kim, Yoonkoo,Kim, Rokyeon,Lee, Ki Hoon,Pollard, Shawn D.,Shin, Yeong Jae,Zhou, Haibiao,Peng, Wei,Lee, Daesu,Meng, Wenjie,Yang, Hyunsoo,Han, Jung Hoon,Kim, Miyoung,Lu, Qingyo Springer Science and Business Media LLC 2018 NATURE MATERIALS Vol.17 No.12
Wang, Lingfei,Cho, Myung Rae,Shin, Yeong Jae,Kim, Jeong Rae,Das, Saikat,Yoon, Jong-Gul,Chung, Jin-Seok,Noh, Tae Won American Chemical Society 2016 NANO LETTERS Vol.16 No.6
<P>Ferroelectric tunnel junctions (FTJs) have attracted increasing research interest as a promising Candidate for nonvolatile memories. Recently, significant enhancements Of tunneling electroresistance (TER) have been realized through modifications of electrode materials. However, direct control of the FTJ performance through modifying the tunneling barrier has not been adequately explored. Here, adding a new direction to FTJ research, we fabricated FTJs with BaTiO3 single barriers (SB-FTJs) and BaTiO3/SrTiO3 composite barriers (CB-FTJs) and reported a systematic study of FTJ performances by varying the barrier thicknesses and compositions:, For the SB-FTJs, the TER is limited by pronounced leakage current for ultrathin barriers and extremely small tunneling current for thick barriers. For the CB-FTJs, the extra SrTiO3 barrier provides an additional degree of freedom to modulate the barrier potential and tunneling behavior. The resultant high tunability can be utilized to overcome the barrier thickness limits and enhance the overall CB-FTJ performances beyond those of SB-FTJ. Our results reveal a new paradigm to manipulate the FTJs through functionalities.</P>
Formation of Ohmic contacts on laser irradiated n-type 6H-SiC without thermal annealing
Yan Wu,Lingfei Ji,Zhenyuan Lin,Minghui Hong,Sicong Wang,Yongzhe Zhang 한국물리학회 2019 Current Applied Physics Vol.19 No.4
In this work, KrF excimer laser irradiation of n-type SiC is used to form Ohmic contacts at the interfaces between the irradiated SiC and various types of metals with different work functions without subsequent thermal annealing. Ohmic contacts are formed between laser-treated 6H-SiC and Ti at a laser fluence of 0.7 J/cm2. Moreover, in the fluence range of 0.7–1.3 J/cm2, Ohmic characteristics are also observed between irradiated 6HSiC and Au, which is a representative inert metal. The laser-induced heavy doping effect reduces the thickness of the Schottky barrier between the metal and SiC, and the formation of graphene sheets on the irradiated SiC surface reduces the barrier height, resulting in the direct formation of Ohmic contacts. Our findings thus demonstrate the potential of this laser treatment method to achieve Ohmic contacts between n-type SiC and a broad range of metal electrodes without requiring high-temperature annealing.
Runze Ding,Lingfei Xiao,Xia Jin 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.3
A class of electric fuel pump system equipped in More-electric Engines with variant loads is studied. A novel robust control method based on a combined linear and quadratic integral sliding mode surface is proposed. The linear sliding mode surface with improved exponential reaching law guarantees that nominal system has satisfying performance with reduced chattering, while the quadratic integral sliding mode surface is responsible for compensation of mismatched uncertainties, enhancing system’s robustness. Besides, mathematical model of electric fuel pump with variant load and leakages is established, which reflects both steady and dynamic characteristics of the fuel pump. In addition, it is proved that combined sliding mode surface can be reached in finite time and remains there. Stability of closed-loop system is proved as well. The effectiveness of the proposed method is verified by simulation results.
Identifying Topic-Specific Experts on Microblog
( Yan Yu ),( Lingfei Mo ),( Jian Wang ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.6
With the rapid growth of microblog, expert identification on microblog has been playing a crucial role in many applications. While most previous expert identification studies only assess global authoritativeness of a user, there is no way to differentiate the authoritativeness in a particular aspect of topics. In this paper, we propose a novel model, which jointly models text and following relationship in the same generative process. Furthermore, we integrate a similarity-based weight scheme into the model to address the popular bias problem, and use followee topic distribution as prior information to make user`s topic distribution more precisely. Our empirical study on two large real-world datasets shows that our proposed model produces significantly higher quality results than the prior arts.
Chaoyang Li,Guangjie Huang,Lingfei Cao,Ruoxi Zhang,Yu Cao,Bin Liao,Lin Lin 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.7
The microstructure evolution and hot deformation behavior of a Li-containing aluminum alloy AA2060 with different initialmicrostructure (homogenized vs. pre-rolled) were studied by isothermal hot deformation. The tests were performed within awide range of deformation temperatures of 370–490 ℃ and strain rates of 0.01–10 s−1. Results show that the stress drop ratioof the pre-rolled specimen is higher than that of the homogenized one under the same deformation condition. Microstructurewere analyzed on the thermal processing maps in unstable and optimum processing domain, and a higher dynamic recrystallizationfraction can be observed in the pre-rolled specimen that has more substructures and smaller grains. Four typesof the dynamic recrystallization were observed and the mechanism for deformation softening was discussed in this work.
The hybrid uncertain neural network method for mechanical reliability analysis
Wensheng Peng,Jianguo Zhang,Lingfei You 한국항공우주학회 2015 International Journal of Aeronautical and Space Sc Vol.16 No.4
Concerning the issue of high-dimensions, hybrid uncertainties of randomness and intervals including implicit and highly nonlinear limit state function, reliability analysis based on the hybrid uncertainty reliability mode combining with back propagation neural network (HU-BP neural network) is proposed in this paper. Random variables and interval variables are as input layer of the neural network, after the training and approximation of the neural network, the response variables are obtained through the output layer. Reliability index is calculated by solving the optimization model of the most probable point (MPP) searching in the limit state band. Two numerical cases are used to demonstrate the method proposed in this paper, and finally the method is employed to solving an engineering problem of the aerospace friction plate. For this high nonlinear, small failure probability problem with interval variables, this method could achieve a good analysis result.